Here is the full list of all 18 The Gallery - there are Episode 1: Call of the Starseed achievements.
Complete Episode 1.
Listen to all the tapes in the game.
Complete the Laboratory level.
Complete the Lower Sewer level.
Complete the Upper Sewer level.
Start a fire on the Beach.
Complete the Beach level.
Light 5 fireworks.
Shoot 3 bells with one clip.
Return all the starfish to the sea.
Douse 6 candles.
Hold the radio on the Beach for three minutes.
Sink 5 volleyball shots in the Beach hoop.
Complete the Tutorial level.
Pick up 4 items.
Spend the night in the Beach tent.
Blink 1000 times.
Smash 15 special bottles.